JP2010269876A - Endless belt for carrying sheet such as paper, and method of manufacturing thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endless belt for carrying sheets such as paper that controls the friction coefficient of the inner circumferential surface of the endless belt, suppresses the variation in the friction coefficient of the inner circumferential surface of the endless belt, easily ensures necessary friction coefficient, prevents the occurrence of such troubles of the endless belt of coming off a rotating roller or slips, and performs stable carriage of feed papers, with regard to the endless belt for carrying sheets such as paper used in an automated paper feeding section in a copier, a printer, a facsimile (FAX) and the like. <P>SOLUTION: The endless belt 1 for carrying sheets such as paper is provided with a number of projecting stripes 3 on the inner circumferential surface of the endless belt body 2 made of rubbery elastic body, in a direction approximately perpendicular to the belt circumferential direction, at predetermined spaces, in parallel and integrally with an endless belt body 2. A thread material for reinforcement is embedded in a direction crossing the parallel projecting stripes 3 and in a spiral shape, inside the belt body 2 near these projecting stripes 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an endless belt for conveying sheet-like sheets such as paper used for, for example, an automatic paper feeder such as a copying machine, a printer, and a facsimile (FAX), and a manufacturing method thereof.

  In general, an endless belt for conveyance is used at a location where sheets are fed, such as an automatic paper feeder of a copying machine or a paper feeder of a facsimile. As this type of endless belt, an endless rubber belt having a woven fabric of nylon or polyester as a core material, or an endless rubber belt having a core material of cotton thread as a core material is generally used. When used by being wound around a rotating roller, meandering or deviation occurs, and in some cases, there is a problem that the belt is detached from the rotating roller.

  In order to solve such a problem, the following Patent Document 1 discloses an endless belt made of a rubber-like elastic body, a core body made of a knitted fabric provided near one surface, and the core body. There is disclosed an endless belt for paper feeding and conveyance, characterized in that the thread-shaped core body is formed of a thread made of polyester or nylon.

JP 2000-255815 A

  However, according to the conventional endless belt for paper feeding and conveying described in Patent Document 1, twisting is likely to occur when the belt manufacturing core (iron core) is covered with a knitted material as a core material in the manufacture of the endless belt. Therefore, there has been a problem that the friction coefficient of the inner peripheral surface of the endless belt is likely to vary.

  Also, if the knitted fabric core is disposed in the vicinity of the inner peripheral surface of the endless belt, the knitted core body may become frayed due to friction between the inner peripheral surface of the endless belt and the rotating roller during repeated use, or the knitted core and the endless belt. There was a problem that the interface of the rubber layer of the main body was cracked, and the knitted core was easily peeled from the rubber layer of the endless belt main body.

  Also, the knitted fabric core itself is very easily deformed, and depending on the location, the mesh size of the knitted fabric core tends to vary, so the degree of penetration of rubber into the belt inner peripheral surface (degree of penetration) Non-uniformity. The non-uniformity of the rubber penetration has caused a problem that the belt inner peripheral surface has a non-uniform stretchability and a non-uniform friction coefficient, resulting in meandering and skewing.

  As described above, in the conventional endless belt for feeding and conveying, the friction coefficient of the inner peripheral surface of the endless belt varies, and when this friction coefficient increases, the endless belt is rotated when the endless belt is wound around the rotating roller and rotated. However, when the coefficient of friction is low, slippage occurs between the endless belt and the rotating roller, and there is a problem that the sheet feeding is not stable.

  The object of the present invention is to solve the above-mentioned problems of the prior art, and to control the friction coefficient of the inner peripheral surface of the endless belt, so that the friction coefficient of the inner peripheral surface of the endless belt does not easily vary and is easily required. Therefore, when the endless belt is wound around the rotating roller and rotated, the endless belt does not come off from the rotating roller, or the endless belt and the rotating roller Let's provide an endless belt for transporting sheets of paper and the like, and a method for manufacturing the same, which can achieve stable transport of sheets and the like without causing slippage between the sheets. It is to do.

  In order to achieve the above object, the invention of an endless belt for conveying a sheet of paper or the like according to claim 1 is directed to a direction substantially perpendicular to the belt circumferential direction on the inner circumferential surface of an endless belt body made of a rubber-like elastic body. A plurality of ridges are provided in parallel with each other at predetermined intervals and integrally with the endless belt body, and the reinforcing thread material crosses the parallel ridges in the belt body closer to the ridges. It is characterized by being embedded in a spiral.

  The invention of claim 2 is an endless belt for conveying a sheet of paper or the like according to claim 1, wherein the cross-sectional shape of each ridge is square or trapezoid, and the width of the tip of each ridge is 0.2 to 0.5 mm, the height of each ridge is 0.1 to 0.5 mm, and the interval between adjacent ridges is 0.1 to 1.0 mm. Yes.

  The invention of claim 3 is the endless belt for transporting a sheet of paper or the like according to claim 1 or 2, wherein the diameter of the reinforcing yarn material is 0.1 to 0.35 mm and is wound in a spiral shape. The pitch of the reinforcing reinforcing thread material is 0.2 to 1.0 mm.

  The invention of claim 4 is the method for producing an endless belt for conveying a sheet of paper or the like according to claim 1.

  The invention of the method for producing an endless belt for conveying a sheet of paper or the like according to claim 4 is characterized in that forming ridges extending in the longitudinal direction of the core are arranged in parallel in the circumferential direction of the core on the outer peripheral surface of the cylindrical or columnar core A step of winding a reinforcing thread material on the outer peripheral surface of the core in a spiral shape in a direction in which the thread material crosses the convex ridge, and a rubber-like elastic body from above the spiral reinforcing thread material A step of applying a liquid unvulcanized composition for forming and filling the liquid unvulcanized composition into a groove between adjacent molding ridges on the outer peripheral surface of the core; and a liquid unvulcanized composition A step of fitting a pre-molded rubber-free elastic body-forming unvulcanized tube over the reinforcing thread material coated with a non-vulcanized tube and a liquid unvulcanized material coated on the spiral reinforcing thread material. The vulcanized composition and the liquid unvulcanized composition filled in the grooves on the outer peripheral surface of the core To obtain a cylindrical molded body for an endless belt and a step of cutting the vulcanized cylindrical molded body for an endless belt removed from the core into a predetermined width from the rubber-like elastic body. On the inner peripheral surface of the endless belt body, a large number of ridges in a direction substantially orthogonal to the belt circumferential direction are provided in parallel with each other at a predetermined interval and integrally with the endless belt body. It is characterized in that an endless belt for transporting a sheet of paper or the like, in which a reinforcing thread material is embedded in a spiral shape in a direction crossing the parallel ridges, is manufactured.

  Invention of Claim 5 is a manufacturing method of the endless belt for sheet-fed sheet conveyances, such as paper of Claim 4, Comprising: The cross-sectional shape of the ditch | groove between the adjacent shaping | molding protrusions of a core outer peripheral surface Is square or trapezoidal, the width of the bottom of the groove is 0.2 to 0.5 mm, the height of the groove is 0.1 to 0.5 mm, and the width of each molding protrusion is 0. .1 to 1.0 mm.

  The invention of claim 6 is a method for producing an endless belt for conveying a sheet of paper or the like according to claim 4 or 5, wherein the diameter of the reinforcing thread material used is 0.1 to 0.35 mm. The pitch of the reinforcing thread material wound spirally is 0.2 to 1.0 mm.

  In the invention of the endless belt for conveying a sheet of paper or the like according to claim 1, a plurality of ridges are formed at predetermined intervals on the inner peripheral surface of the endless belt body made of a rubber-like elastic body in a direction substantially perpendicular to the belt circumferential direction. It is provided in parallel with each other and integrally with the endless belt main body, and the reinforcing thread material is embedded in a spiral manner in the direction crossing the parallel convex stripes inside the belt main body near these convex stripes. According to the first aspect of the present invention, the reinforcing thread material is helically embedded in the belt body inside the endless belt body inner peripheral surface near the parallel ridges. Is difficult to peel from the rubber-like elastic layer of the endless belt. In addition, there are a large number of juxtaposed rubber elastic bodies on the inner peripheral surface of the endless belt, and by adjusting the width of these ridges and the spacing between the ridges, Since the friction coefficient of the peripheral surface can be easily controlled, the friction coefficient of the inner peripheral surface of the endless belt is less likely to vary, and an endless belt for transporting a sheet of paper or the like having the necessary friction coefficient can be reliably obtained. . As described above, since the necessary friction coefficient can be easily secured on the inner peripheral surface of the endless belt, when the endless belt is wound around the rotating roller and rotated, the trouble that the endless belt is detached from the rotating roller is prevented. No slippage occurs between the endless belt and the rotating roller, and it is possible to achieve stable conveyance of sheet feeding such as paper sheets.

  Invention of Claim 2 is an endless belt for sheet-like sheet conveyance, such as papers of Claim 1, Comprising: The width | variety of the front-end | tip part of each protrusion is 0.2-0.5 mm, The height is 0.1 to 0.5 mm, and the interval between adjacent ridges is 0.1 to 1.0 mm. According to the invention of claim 2, By defining the width, the height of each ridge, and the spacing between adjacent ridges, the friction coefficient of the inner peripheral surface of the endless belt can be controlled within the optimum range, and papers having the necessary friction coefficient, etc. There is an effect that an endless belt for conveying a single sheet can be obtained with certainty.

  The invention of claim 3 is the endless belt for transporting a sheet of paper or the like according to claim 1 or 2, wherein the diameter of the reinforcing yarn material is 0.1 to 0.35 mm and is wound in a spiral shape. The pitch of the reinforcing thread material is 0.2 to 1.0 mm. According to the invention of claim 3, the diameter of the reinforcing thread material and the pitch of the reinforcing thread material wound spirally By prescribing the endless belt, the endless belt can be sufficiently reinforced, and the sheetless sheet such as paper can be conveyed stably by the endless belt for a long period of time, thereby improving the durability of the endless belt. There is an effect that can be.

  The invention of claim 4 is the method for producing an endless belt for conveying a sheet of paper or the like according to claim 1.

  The invention of the method for producing an endless belt for conveying a sheet of paper or the like according to claim 4 is characterized in that forming ridges extending in the longitudinal direction of the core are arranged in parallel in the circumferential direction of the core on the outer peripheral surface of the cylindrical or columnar core A step of winding a reinforcing thread material on the outer peripheral surface of the core in a spiral shape in a direction in which the thread material crosses the convex ridge, and a rubber-like elastic body from above the spiral reinforcing thread material A step of applying a liquid unvulcanized composition for forming and filling the liquid unvulcanized composition into a groove between adjacent molding ridges on the outer peripheral surface of the core; and a liquid unvulcanized composition A step of fitting a pre-molded rubber-free elastic body-forming unvulcanized tube over the reinforcing thread material coated with a non-vulcanized tube and a liquid unvulcanized material coated on the spiral reinforcing thread material. The vulcanized composition and the liquid unvulcanized composition filled in the grooves on the outer peripheral surface of the core To obtain a cylindrical molded body for an endless belt and a step of cutting the vulcanized cylindrical molded body for an endless belt removed from the core into a predetermined width from the rubber-like elastic body. On the inner peripheral surface of the endless belt body, a large number of ridges in a direction substantially orthogonal to the belt circumferential direction are provided in parallel with each other at a predetermined interval and integrally with the endless belt body. An endless belt for transporting a sheet of paper or the like, in which a reinforcing thread material is embedded in a spiral shape in a direction crossing the parallel ridges, is manufactured. Therefore, the reinforcing thread material is difficult to peel off from the rubber-like elastic layer of the endless belt, the friction coefficient of the inner peripheral surface of the endless belt can be easily controlled, and the friction coefficient of the inner peripheral surface of the endless belt varies. A sheet of paper that is difficult and has the necessary coefficient of friction Reliably endless belt sheet transport, yet an effect that efficiently and thus can be manufactured at low cost.

  Invention of Claim 5 is a manufacturing method of the endless belt for sheet-fed sheet conveyances, such as paper of Claim 4, Comprising: The cross-sectional shape of the ditch | groove between the adjacent shaping | molding protrusions of a core outer peripheral surface Is square or trapezoidal, the width of the bottom of the groove is 0.2 to 0.5 mm, the height of the groove is 0.1 to 0.5 mm, and the width of each molding protrusion is 0. According to the invention of claim 5, the width of the groove bottom between the molding ridges on the outer peripheral surface of the core, the height of the groove, and the parallel molding By defining the width of the ridge, on the contrary, the width of the tip of each ridge composed of a large number of parallel rubber-like elastic bodies on the inner peripheral surface side of the endless belt after manufacture, the height of each ridge , And the spacing between the ridges, which can stabilize the friction coefficient of the inner peripheral surface of the endless belt. An effect that it is possible to reliably manufacture the paper, or the like leaves the sheet transporting endless belt having.

  The invention of claim 6 is a method for producing an endless belt for conveying a sheet of paper or the like according to claim 4 or 5, wherein the diameter of the reinforcing thread material used is 0.1 to 0.35 mm. The pitch of the reinforcing thread member wound spirally is 0.2 to 1.0 mm. According to the invention of claim 6, the diameter of the reinforcing thread member and the reinforcing member wound spirally By defining the pitch of the thread material, it is possible to manufacture an endless belt that is reliably reinforced by the reinforcing thread material. This is advantageous in that the durability of the endless belt can be improved.

1 is a schematic perspective view of an endless belt for conveying a sheet of paper or the like showing an embodiment of the present invention. It is a principal part expanded sectional perspective view of the endless belt for sheet-fed sheet conveyance, such as paper of FIG. It is a schematic perspective view of the stainless steel core used for manufacture of the endless belt for sheet-fed sheet conveyance of this invention. After the reinforcing thread material is spirally wound around the outer peripheral surface of the core of FIG. 3, a liquid unvulcanized composition for forming a rubber-like elastic body is applied from above the spiral reinforcing thread material, and further molded in advance. It is a schematic perspective view which shows the state before fitting the unvulcanized tube for rubber-like elastic body formation on a core. Obtained after vulcanization of the unvulcanized tube set in FIG. 4, the liquid unvulcanized composition applied to the helical reinforcing thread material, and the liquid unvulcanized composition filled in the grooves on the outer peripheral surface of the core. FIG. 2 is a schematic perspective view showing a tubular molded body for an endless belt, showing a state before the core is removed. It is an expanded sectional view which follows the AA line of FIG.

  Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

  FIG. 1 is a schematic perspective view of an endless belt for conveying a sheet of paper or the like showing an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional perspective view of a main part of the endless belt.

  Referring to FIGS. 1 and 2, an endless belt (1) for transporting a sheet of paper or the like according to the present invention is used in, for example, an automatic paper feeder of a copying machine, a printer, a facsimile machine, etc. It is used by being wound around a pair of front and rear rotation drive rollers (21) and a rotation roller (22).

  The endless belt (1) for conveying a sheet of paper or the like according to the present invention has a large number of elastic body protrusions on the inner peripheral surface of an endless belt body (2) made of a rubber-like elastic body in a direction substantially perpendicular to the belt circumferential direction. The strips (3) are provided in parallel with each other at predetermined intervals and integrally with the endless belt body (2), and the reinforcing thread material (4) is provided inside the belt body (2) close to the convex strips (3). Are embedded in a spiral manner in a direction crossing the parallel ridges (3).

  Here, an ethylene-propylene-diene copolymer (EPDM), acrylonitrile butadiene rubber (NBR), polyurethane, butyl rubber, or the like can be used as the rubber composition constituting the endless belt body (2) for feeding and conveying paper. The rubber hardness of the endless belt body (2) is preferably 20 to 50 ° according to JIS-A.

  In the present invention, the cross-sectional shape of each ridge (3) of a number of ridges (3) provided on the inner peripheral surface of the endless belt body (2) in a direction substantially perpendicular to the belt circumferential direction is a square shape. Or it is trapezoid and it is preferable that the width | variety of the front-end | tip part of each protruding item | line (3) is 0.2-0.5 mm, and it is more preferable that it is 0.3-0.5 mm. The height of each ridge (3) is preferably from 0.1 to 0.5 mm, and more preferably from 0.2 to 0.5 mm. Moreover, the space | interval between adjacent protrusion (3) (3), ie, the width | variety of the clearance gap (5) between adjacent protrusion (3) (3), is 0.1-1.0 mm. Is preferable, and it is more preferable that it is 0.3-0.7 mm.

  Here, if the width of the tip of each protrusion (3) on the inner peripheral surface of the endless belt body (2) is less than 0.2 mm, the amount of rubber to be applied to the reinforcing thread material (4) increases. This is not preferable because the exposure of rubber to the inner peripheral surface of the endless belt (1) increases and the friction coefficient increases. Moreover, when the width | variety of the front-end | tip part of each protrusion (3) exceeds 0.5 mm, since the amount of rubber | gum which coat | covers the thread material for reinforcement (4) decreases and a friction coefficient falls, it is unpreferable.

  Moreover, if the height of each protrusion (3) is less than 0.1 mm, the rubber layer which wears the reinforcing thread material (4) becomes thin, and the reinforcing thread material (4) becomes the endless belt body (2). Since the rubber layer for covering the reinforcing thread material (4) becomes thin, the reinforcing thread material (4) comes into contact with the inner surface of the belt at the time of use with the rotating rollers (21) and (22). It is not preferable because it is easily destroyed by wear and the friction coefficient is lowered. Moreover, when the height of each protrusion (3) exceeds 0.5 mm, the recessed part of a rubber layer will become large and it will become soft, and for that reason, a friction coefficient will become high. Further, the reinforcing thread material (4) cannot be disposed in the vicinity of the surface (belt inner surface side), which is not preferable.

  Furthermore, if the space | interval between adjacent protrusion (3) (3) is less than 0.1 mm, the rubber | gum amount which wears a thread-like core will decrease, and a friction coefficient will fall. Further, the reinforcing thread material (4) is not preferable because it easily peels from the rubber-like elastic body. Moreover, when the space | interval between adjacent convex strips (3) (3) exceeds 1.0 mm, the base part which hold | maintains the thread material for reinforcement (4) will decrease, and it will reinforce on the belt inner surface at the time of molding. This is not preferable because it is difficult to accurately dispose the thread material (4), the rubber layer is exposed to the inner surface of the belt, and the friction coefficient is increased.

  Next, as the reinforcing thread material (4), for example, polyester thread or nylon (registered trademark) thread is preferably used.

  Here, the diameter of the reinforcing thread material (4) is preferably 0.1 to 0.35 mm, and more preferably 0.15 to 0.30 mm. When this is represented by the count of the thickness of the reinforcing thread material (4), the thickness (diameter) of the reinforcing thread material (4) is # 8 to # 100 (approximately 0.35 to 0.1 mm in diameter). Preferably, it is # 20 to # 80 (about 0.30 to 0.15 mm), and more preferably.

  Here, if the diameter of the reinforcing thread material (4) is less than 0.1 mm, it is too thin to provide sufficient strength as an endless belt (1) for transporting sheets of paper and the like. When the diameter of the thread material (4) exceeds 0.35 mm, it is too thick to be wound, and not only the workability is lowered, but also the adhesion to the rubber-like elastic body is lowered. 4) is not preferable because it is difficult to fit within the endless belt body (2) made of a rubber-like elastic body.

  In the present invention, the pitch between the reinforcing thread members (4) and (4) wound spirally is, for example, 0.2 to 1.0 mm, and preferably 0.35 to 0.7 mm. . Here, when the pitch between the reinforcing thread members (4) and (4) wound spirally is less than 0.2 mm, the strength is excessively increased and the necessary elongation cannot be obtained, which is not preferable. Further, when the pitch between the reinforcing thread members (4) and (4) wound spirally exceeds 1.0 mm, the strength as an endless belt (1) for conveying a sheet of paper or the like decreases. This is not preferable.

  Next, FIG. 3 to FIG. 6 show an embodiment of a method for producing an endless belt (1) for conveying a sheet of paper or the like according to the present invention.

  First, as shown in FIG. 3, for example, on the outer peripheral surface of a cylindrical or columnar core (11) made of stainless steel, a forming protrusion (12) extending in the longitudinal direction of the core (11) is provided. It is provided in parallel in the circumferential direction.

  Here, the cross-sectional shape of the concave groove (13) between the adjacent molding ridges (12) and (12) adjacent to each other on the outer peripheral surface of the core (11) is a square or trapezoid, and the concave groove (13) The width of the bottom is preferably 0.2 to 0.5 mm, and more preferably 0.3 to 0.5 mm. The height of the concave groove (13) is preferably 0.1 to 0.5 mm, and more preferably 0.2 to 0.5 mm. Moreover, it is preferable that the width | variety of each protruding item | line for shaping | molding (12) is 0.1-1.0 mm, and it is more preferable that it is 0.3-0.7 mm.

  Next, as shown in FIG. 4, the reinforcing thread material (4) is placed on the outer peripheral surface of the core (11) in a direction in which the thread material (4) crosses the forming protrusion (12). And the step of winding in a spiral so that the pitch between the reinforcing thread materials (4) and (4) is 0.2 to 1.0 mm, preferably 035 to 0.7 mm, and the spiral reinforcement A liquid unvulcanized composition for rubber-like elastic body formation is applied from above the thread material (4), the liquid unvulcanized composition is impregnated into the spiral reinforcing thread material (4), and the liquid unvulcanized composition is impregnated. A step of filling the vulcanized composition into the groove (13) between the adjacent molding ridges (12) and (12) on the outer peripheral surface of the core (11), and a reinforcement applied with the liquid unvulcanized composition From above the thread material (4), a pre-formed unvulcanized tube (6) for forming a rubber-like elastic body is fitted over substantially the entire length of the core (11). Implementing a step of.

  Furthermore, a core (11) comprising a spiral reinforcing thread material (4) coated with a liquid unvulcanized composition for rubber-like elastic body formation and an unvulcanized tube (6) for rubber-like elastic body formation, In a vulcanized can, the unvulcanized tube (6), the liquid unvulcanized composition applied to the helical reinforcing thread material (4), and the molding ridges adjacent to the outer peripheral surface of the core (11) ( 12) The liquid unvulcanized composition filled in the concave groove (13) between (12) is vulcanized and bonded together, and as shown in FIGS. 5 and 6, cylindrical molding for an endless belt The step of obtaining the body (10) is performed.

  Then, after polishing the surface of the vulcanized endless belt tubular molded body (10), the vulcanized endless belt tubular molded body (10) removed from the core (11), the core is extracted, Furthermore, the endless belt (1) for conveying a sheet of paper or the like is manufactured by carrying out a step of cutting the cylindrical shaped body (10) for the endless belt into a predetermined width in a direction crossing the endless belt. .

  As shown in FIGS. 1 and 2, the endless belt (1) for conveying a sheet of paper or the like obtained by the method of the present invention has an inner peripheral surface of an endless belt body (2) made of a rubber-like elastic body. In addition, a large number of ridges (3) in a direction substantially perpendicular to the belt circumferential direction are provided in parallel with each other at a predetermined interval and integrally with the endless belt body (2), and the belts near these ridges (3). A reinforcing thread material (4) is embedded in the main body (2) in a spiral manner in a direction crossing the parallel ridges (3).

  According to the method of the present invention, the reinforcing thread material (4) is difficult to peel off from the rubber-like elastic layer of the endless belt (1), and the friction coefficient of the inner peripheral surface of the endless belt (1) can be easily controlled. Endless belt (1) The friction coefficient of the inner peripheral surface is less likely to vary, and the endless belt (1) for transporting a sheet of paper or the like having the necessary friction coefficient is manufactured reliably and efficiently, and at a low cost. It is something that can be done.

  Next, examples of the present invention will be described together with comparative examples, but the present invention is not limited to these examples.

Example 1
By the method of the present invention, an endless belt (1) for sheet feeding and conveyance was produced as follows as an endless belt for conveying sheets of paper and the like.

  First, a stainless steel columnar core (11) shown in FIG. 3 was prepared. Forming ridges (12) extending in the longitudinal direction of the core (11) are provided in parallel on the outer peripheral surface of the core (11) in the circumferential direction of the core (11).

  Here, as for the core (11), the cross-sectional shape of the ditch | groove (13) between the adjacent protruding ridges (12) (12) on the core outer peripheral surface is a square, and the dimple groove (13) The width of the bottom portion was 0.3 mm, the height of each groove (13) was 0.2 mm, and the width of each molding protrusion (12) was 0.3 mm. The diameter of the core (11) including the forming ridges (12) was 40.7 mm, and the total length of the core (11) was 700 mm.

  On the outer peripheral surface of the core (11), a reinforcing yarn material (4) made of polyester having a diameter of 0.2 mm (# 30) is placed in a direction in which the yarn material (4) crosses the protruding projection (12). And spirally wound at a pitch of 0.3 mm.

  Next, a liquid unvulcanized composition for forming a rubber-like elastic body in which an ethylene-propylene-diene copolymer (EPDM) is dissolved in a solvent made of toluene is applied on the spiral reinforcing thread material (4). At the same time, the liquid unvulcanized composition was filled into the concave grooves (13) between the parallel forming ridges (12) and (12) on the outer peripheral surface of the core (11).

  Furthermore, an unvulcanized tube for forming a rubbery elastic body (6) having an inner diameter of 41 mm and a thickness of 1.5 mm is formed in advance from above the reinforcing thread material (4) coated with the liquid unvulcanized composition. Was fitted over substantially the entire length of the core (11).

  Then, a spiral reinforcing thread material (4) coated with a liquid unvulcanized composition for forming a rubbery elastic body and a core (11) comprising an unvulcanized tube (6) for forming a rubbery elastic body are added. Put in a sulfur can, hold at a temperature of 150 ° C. for 45 minutes, and apply to the unvulcanized tube (6), the liquid unvulcanized composition applied to the helical reinforcing thread material (4), and the core (11 ) The liquid unvulcanized composition filled in the concave grooves (13) between the molding ridges (12) (12) adjacent to each other on the outer peripheral surface is vulcanized and joined together to form a cylindrical shape for an endless belt A molded body (10) was obtained.

  After polishing the surface of the endless belt tubular molded body (10) after vulcanization, the core (11) is removed, and then the endless belt tubular molded body (10) is 25 mm wide in a direction crossing the core. Cut to produce an endless belt (1) for feeding and feeding as an endless belt for feeding sheets such as paper.

  As shown in FIGS. 1 and 2, the obtained endless belt (1) for feeding and conveying is formed on the inner peripheral surface of the endless belt body (2) made of ethylene-propylene-diene copolymer (EPDM). A number of ridges (3) in a direction substantially perpendicular to the circumferential direction are provided in parallel with each other at a predetermined interval and integrally with the endless belt body (2), and the belt body (2 near the ridges (3) is provided. ) The reinforcing thread material (4) was embedded in a spiral manner in a direction crossing the parallel ridges (3).

  Here, on the inner peripheral surface of the endless belt body (2), the cross-sectional shape of each of the ridges (3) of the ridges (3) provided in a direction substantially orthogonal to the belt circumferential direction is a square. The width of the tip of each ridge (3) is 0.3 mm, the height of each ridge (3) is 0.2 mm, and between adjacent ridges (3) (3) The interval, that is, the width of the gap (5) between the adjacent ridges (3) and (3) was 0.3 mm.

Examples 2-13
In the same manner as in Example 1 above, an endless belt (1) for feeding and conveying sheets as an endless belt for conveying sheets of paper and the like according to the present invention is manufactured, as shown in Table 1 below. , The width of the tip of each ridge (3) on the inner peripheral surface of the endless belt body (2), the height of each ridge (3), the spacing between adjacent ridges (3) (3), That is, the width of the gap (5) between the adjacent ridges (3) and (3), the inner diameter of the reinforcing thread material (4), and the pitch between the reinforcing thread materials (4) and (4) are changed. Thus, various endless belts (1) for sheet feeding and conveyance according to the present invention were manufactured.

Comparative Example 1
For comparison, an endless belt for paper feeding and conveyance as a conventional product was manufactured as follows. First, a circular knitted fabric made of nylon (registered trademark), which is the first core body, is placed on the peripheral surface of a cylindrical core having a diameter of 40.7 mm, and then the polyester reinforcement used in Example 1 is applied thereon. The yarn material was wound spirally at the same pitch as in Example 1.

  Next, a liquid unvulcanized composition for forming a rubbery elastic body in which an ethylene-propylene-diene copolymer (EPDM) is dissolved in a solvent made of toluene is applied on the knitted fabric and the spiral reinforcing yarn material. did.

  Further, an unvulcanized tube for rubber-like elastic body formation similar to the case of Example 1 formed in advance from above the knitted fabric and the reinforcing yarn material coated with the liquid unvulcanized composition is abbreviated as the core. A conventional endless belt for feeding and conveying for comparison was obtained in the same manner as in Example 1 below.

(Measurement of friction coefficient)
The endless belt (1) for sheet feeding and conveyance as an endless belt for conveying various sheets of paper and the like obtained in Examples 1 to 13 according to the present invention, and the endless sheet feeding and conveyance unit obtained in Comparative Example 1 For the belt, the friction coefficient was measured using a HEIDON type friction coefficient measuring machine (in accordance with JIS P 8147) manufactured by Shinto Kagaku Co., Ltd., and the obtained results are shown in Table 1 below. .

  In addition, about the endless belts (1) for sheet feeding and conveyance obtained in Examples 1 to 13 according to the present invention, 100 endless belts (1) are manufactured in each example, and all of these endless belt inner circumferences are manufactured. The coefficient of friction of the surface was measured, and the average value of the coefficient of friction was calculated.

(Friction coefficient variation)
Further, the difference between the maximum value and the minimum value of the friction coefficient of 100 endless belts (1) for sheet feeding and conveyance was calculated, and this is shown in Table 1 below as the variation of the friction coefficient.

On the other hand, with respect to the endless belt for paper feeding / conveying of Comparative Example 1, 20 of the endless belts were manufactured, and the average value of the friction coefficients was calculated. The difference between the minimum values was calculated, and this was shown in Table 1 below as the variation of the friction coefficient.

  As is clear from the results of Table 1 above, according to the endless belt (1) for sheet feeding and conveyance as the endless belt for sheet-like sheet conveyance obtained in Examples 1 to 13 of the present invention, the friction coefficient The variation was 0.50 or less, and there was very little variation.

  On the other hand, according to the conventional endless belt for feeding and conveying manufactured in Comparative Example 1, the variation in the friction coefficient was as very large as 0.65.

  Then, the endless belt for feeding and conveying manufactured in Examples 1 to 13 of the present invention was incorporated into an actual copying machine (trade name, imagio MP C3000, manufactured by Ricoh Co., Ltd.), and a sheet feeding test was performed. None of them were meandering or offset, and had excellent paper feeding properties.

1: Endless belt for transporting sheets such as paper (endless belt for feeding and transporting paper)
2: Endless belt body 3: Convex strip 4: Reinforcement thread material 5: Gap between adjacent convex strips 6: Unvulcanized tube 10 for rubber-like elastic body formation: Cylindrical molded body 11 for endless belt: Circle Columnar core 12: forming ridge 13: groove 21: rotating roller 22: rotating roller

Claims (6)

  On the inner peripheral surface of the endless belt body made of a rubber-like elastic body, a large number of ridges are provided in parallel with each other at a predetermined interval in a direction substantially perpendicular to the belt circumferential direction. An endless belt for conveying a sheet of paper or the like, characterized in that a reinforcing thread material is embedded in a spiral shape in a direction crossing the parallel protruding stripes inside a belt body close to the stripe.   The cross-sectional shape of each ridge is square or trapezoid, the width of the tip of each ridge is 0.2 to 0.5 mm, and the height of each ridge is 0.1 to 0.5 mm. The endless belt for transporting a sheet of paper or the like according to claim 1, wherein a distance between adjacent ridges is 0.1 to 1.0 mm.   The diameter of the reinforcing thread material is 0.1 to 0.35 mm, and the pitch of the reinforcing thread material wound in a spiral shape is 0.2 to 1.0 mm. An endless belt for conveying a sheet of paper or the like as described in 1.   On the outer peripheral surface of the cylindrical or columnar core, forming ridges extending in the longitudinal direction of the core are provided in parallel in the core peripheral direction, the reinforcing thread material is provided on the outer peripheral surface of the core, and the thread material is A step of spirally winding in a direction crossing the forming ridge, and applying a liquid unvulcanized composition for rubber-like elastic body formation from above the spiral reinforcing thread material, and the liquid unvulcanized composition The step of filling a groove between adjacent molding ridges on the outer peripheral surface of the core and the formation of a rubber-like elastic body molded in advance from above the reinforcing yarn material coated with the liquid unvulcanized composition A step of fitting an unvulcanized tube for use, a non-vulcanized tube, a liquid unvulcanized composition applied to a helical reinforcing thread material, and a liquid unvulcanized composition filled in the groove on the outer peripheral surface of the core Vulcanizing the objects and bonding them together to obtain a cylindrical molded body for an endless belt; The endless belt-shaped tubular molded body after vulcanization is cut to a predetermined width, and the inner circumferential surface of the endless belt body made of a rubber-like elastic body is substantially perpendicular to the belt circumferential direction. A number of ridges are provided in parallel with each other at predetermined intervals and integrally with the endless belt body. Inside the belt body near the ridges, the reinforcing thread material crosses the parallel ridges. A method for producing an endless belt for conveying a sheet of paper or the like, which is embedded in a spiral shape, and for conveying an endless belt for conveying a sheet of paper or the like.   The cross-sectional shape of the groove between adjacent molding ridges on the outer peripheral surface of the core is square or trapezoidal, the width of the bottom of the groove is 0.2 to 0.5 mm, and the height of the groove The endless belt for transporting a sheet of paper or the like according to claim 4, characterized in that the width of each of the forming ridges is 0.1 to 1.0 mm. Manufacturing method.   The diameter of the reinforcing thread material used is 0.1 to 0.35 mm, and the pitch of the reinforcing thread material wound spirally is 0.2 to 1.0 mm. Or the manufacturing method of the endless belt for sheet | seats conveyance of sheet etc. of 5 or 5.

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